US7086260B2 - Method and device for controlling the thickness of a rolled product - Google Patents
Method and device for controlling the thickness of a rolled product Download PDFInfo
- Publication number
- US7086260B2 US7086260B2 US10/811,499 US81149904A US7086260B2 US 7086260 B2 US7086260 B2 US 7086260B2 US 81149904 A US81149904 A US 81149904A US 7086260 B2 US7086260 B2 US 7086260B2
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- Prior art keywords
- thickness
- speed
- stand
- roll stand
- roll
- Prior art date
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- Expired - Fee Related, expires
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/16—Control of thickness, width, diameter or other transverse dimensions
- B21B37/18—Automatic gauge control
- B21B37/20—Automatic gauge control in tandem mills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/46—Roll speed or drive motor control
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/48—Tension control; Compression control
- B21B37/52—Tension control; Compression control by drive motor control
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/58—Roll-force control; Roll-gap control
Definitions
- the invention relates to a method for controlling the final thickness of a rolled product, at the outlet of a tandem rolling mill, enabling in particular to optimise the productivity of such a plant while balancing the currents of the driving motors of the different stands, in order to enable an increase in the overall rolling speed, without any risks of overloading either of the motors.
- the invention also relates to a control device enabling the implementation of such a method.
- the invention is provided especially for cold rolling of metal bands, for instance of steel, but may be applied, generally, to any plant including several roll stands operating in tandem for gradual reduction in thickness of a product running successively between the working rolls of said stands.
- a rolling mill includes, generally, at least two working rolls mounted inside a supporting stand and delineating a gap for letting through the product to be rolled, the stand carrying means for applying an adjustable clamping load between the rolls.
- the number of rolls may vary according to the type of rolling mill for instance duo, quarto, sexto or other.
- the latter are driven into rotation around their axis by motorised means which apply a driving torque, either directly to the working rolls, or indirectly, to the back-up rolls in a quarto assembly or to intermediate rolls in a sexto assembly.
- the thickness of the band running through the successive stands of a tandem rolling mill is controlled by monitoring the mass flow ratio.
- the thickness of the band at the outlet of the first stand is kept constant, on the one hand, and the speed ratios between the first and the last stand are held constant, on the other hand.
- the speeds of the intermediate stands may be deducted from these conditions since they are imposed by the mass flow preservation law of the metal running through the stands of the rolling mill, and they are reversely proportional to the reductions ascribed to each rolling stand.
- the thickness at the outlet of the first stand is generally controlled, on a modern rolling mill, by the clamping means which are driven by a feeler gauge situated downstream of said stand.
- the whole control system of a tandem rolling mill is currently called ⁇ automatic gage control>> or AGC.
- each inter-stand space receives a traction measuring device such as a tensimeter roll which controls the clamping level of the stand situated downstream.
- a feeler gauge placed at the outlet of the rolling plant, controls the final thickness by acting on the speed of the last stand or of the last two stands of the tandem rolling mill.
- Such a system for controlling the inter-stand tractions is also called ⁇ automatic tension control>> or ATC.
- the strength and the rolling torque applied, respectively, for a certain reduction in thickness, by the clamping means and by the driving means of the working rolls, should be suited to the characteristics of the product to be rolled.
- a ⁇ rolling pattern>> should therefore be worked out, which determines the successive reductions in thickness allocated to each stand relative to geometric and metallurgic characteristics of the product.
- a pre-adjustment system may be used for calculating the rolling patterns, considering all the characteristics of the plant such as the powers of the driving motors, the maximum intensities and speeds of the motors, the possible maximum stresses on the roll stands, etc.
- This pre-adjustment system must also take into account the geometric and metallurgic characteristics of the product to be rolled and the product/rolling mill interface to establish the rolling parameters adapted to each format and nature of band forming the annual production of the rolling mill. These parameters are, in particular, the inlet thickness and the outlet thickness, possibly the temperature, the hardness, or still the flow constraint and the variation of this constraint over the reduction in thickness, as well as the friction coefficient in the sheet/roll interface.
- This pre-adjustment system may be in the form of multiple inlet tables providing with the adjustments to be displayed for each stand relative to the inlet parameters.
- the operators input beforehand the characteristics of the bands to be rolled according to the programme of production forecast and it then suffices to validate such data at the arrival of the head of the band of the product considered in the rolling plant.
- the means for driving the rolls into rotation are electric motors with a basic speed for which they provide their rated torque. Consequently, when designing the rolling mill train, an average reduction in thickness is considered for each stand.
- the motors being, generally, built to have the same basic speed, a speed reducer is installed very often between the motor and the stand, whereof the reduction ratio is different for each stand in order to obtain the same speed on the high speed shaft of the reducing gear.
- the invention intends to solve such a problem, and, in particular, to optimise the productivity of the plant, thanks to a method enabling to increase the efficiency of the control device without any excessive complication thereof.
- the method according to the invention may, indeed, be implemented by simple and relatively cheap means which are simply added to the control means used conventionally.
- the invention relates therefore, generally, to a method for controlling the final thickness of a rolled product at the outlet of a tandem rolling mill associated with a general control system of the different stands determining gradual increase in the rotational speed of the rolls in relation to the gradual variation in thickness from one stand to the next, and to a control system of the reduction in thickness and in tension of the product in each space between two successive stands.
- control system performs, in real time, dynamic balance, between the different stands, of the torques applied in each stand on the working rolls, without any noticeable disturbance of the final thickness of the product at the outlet of the plant.
- the regulation system controls a variation in the rolling speed in at least one of the stands and modifies consequently the distribution of the reduction in thickness and the gradation of the speeds between the different stands in order to distribute substantially equally, on the whole motorised means, the load to be applied for driving the product at a given speed at the outlet of the plant while maintaining the final thickness at a set speed.
- the global reduction in thickness to be performed between the inlet and the outlet of the plant is distributed according to a rolling pattern, using a pre-adjustment system.
- the load imposed, in each stand, to the means for driving the working rolls into rotation for obtaining the speed set by the rolling pattern is permanently detected, and the reduction in thickness allocated to the most loaded stand is reduced in order to provide dynamic balance of the loads applied to the different stands.
- the rotational speed of the rolls of said stand is diminished with respect to the speed set by the rolling pattern.
- this potential thickness defect is compensated for by anticipation by controlling reverse variation of the speed of all the stands situated upstream of said most loaded stand, liable to decrease the reduction in thickness performed in said upstream stands, in order to perform a load transfer on the stands placed downstream of said most loaded stand.
- the rolling speed is increased in the previous stand situated immediately upstream, in order to decrease the thickness of the product before arriving in the most loaded stand.
- Such an increase in speed in the previous stand determines a corresponding increase in the speed of the product when entering the most loaded stand which might generate a thickness defect at the outlet of the plant for a transient period.
- this potential thickness defect is compensated for, by anticipation, while controlling an increase in the rolling speed in the stands situated still upstream of said previous stand, in order to perform a load transfers on all the stands placed upstream of the most loaded stand, while increasing the reduction in thickness performed in each thereof.
- the variation in thickness of the product is monitored permanently as it progresses from the first to the last stand of the plant, in order to control a variation in speed of certain stands liable to compensate for a potential thickness defect for a transient period corresponding to the time necessary beforehand, between two successive stands, of the variation in thickness resulting from a variation in speed of the upstream stand, in order to maintain constant, permanently, the thickness of the product at the outlet of the last stand of the plant.
- Such a method enables, after performing dynamic balance of the loads applied on all the stands, to increase the rolling speed in one of the stands acting as a pivoting stand, the control system then causing consequently the speeds of the other stands to vary, in order to increase the speed of the product at the outlet of the plant without disturbing the final thickness and while preserving dynamic balance between all the stands.
- the means driving the rolls are, generally, electric motors.
- the control system according to the invention enables to perform dynamic balance of the currents without exceeding the rated intensity in each motor.
- the invention also concerns a control device improved for the implementation of the method and including, to this end, a circuit formed as a closed-loop for dynamic balancing, between the different stands, of the torques applied by the motorised means of each stand in order to obtain the final thickness desired and to maintain the latter at substantially constant value.
- the dynamic balancing circuit includes means for correcting, on each stand, the speed setpoint determined by the pre-adjustment system, in order to modify the distribution of the reduction in thickness between the different stands.
- the dynamic balancing circuit includes a module for controlling the transients acting as a closed-loop on the driving means of the rolls, in order to provide, by anticipation, an additional correction to the speed setpoint for a transient infeed period of the product between a stand whereof the speed setpoint has been corrected and the following stand.
- this module for controlling the transients is associated with a device for permanently following the variation in thickness of the product when running between the inlet and the outlet of the plant, which determines the times of the beginning and of the end of the transient period during which an additional correction is made to the speed setpoint of at least one of the stands.
- FIG. 1 represents diagrammatically a tandem rolling mill fitted with a thickness and traction control system according to the prior art.
- FIG. 2 represents diagrammatically a tandem rolling mill fitted with a thickness and traction control system according to the invention.
- FIG. 3 illustrates diagrammatically the distribution of the currents of the motors of a tandem rolling mill according to the prior art.
- FIG. 1 represents diagrammatically a whole tandem rolling mill, including five roll stands marked 1 to 5 .
- Such a plant provided, for instance for cold rolling of sheets, operates continuously, and is associated with an inlet traction device.
- Each rolling mill stand for instance of quarto type, includes two working rolls T, T′ delineating a gap for letting through the product to be rolled B and resting upon two back-up rolls S, S′ between which is applied a rolling load by clamping means such as hydraulic jacks 11 , 21 , 31 , 41 , 51 .
- a rotation driving means such as an electric motor 12 , 22 , 32 , 42 , 52 applies, directly or indirectly, a rolling torque on at least one of the working rolls T, T′.
- the rolling load and the rolling torque depend on the nature of the product to be rolled, as well as the reduction in thickness to be performed in each stand.
- the thickness of the product is held constant at the outlet of the stand 1 .
- a feeler gauge 13 which will fulfil this function by acting on the hydraulic clamp 11 .
- This control may also be improved by measuring the raw thickness h o of the band B at the inlet of the plant using another feeler gauge 13 ′ installed at the inlet of the stand 1 and also acting on the hydraulic clamp 11 thereof.
- a rolling pattern established beforehand enables, relative to the characteristics of the product to be rolled and of the possibilities of the plant, to distribute the reduction in thickness between the different stands and the resulting gradation of the speeds in order to follow the mass flow preservation law.
- h i designates the thickness of the band at the outlet of a stand of rang i and V i the speed of outlet of the product, which corresponds to the driving speed of the rolls of the same stand
- a control system enables, on the basis of the indications given by the tensimeters 15 , 25 , 35 , 45 installed at the outlet, respectively, of the stands 1 , 2 , 3 , 4 to act on the hydraulic clamping means, respectively 21 , 31 , 41 , 51 of the following stands 2 , 3 , 4 , 5 in order to correct the reduction in thickness and, consequently, the torque applied, in order to maintain constant traction in each space 10 , 20 , 30 , 40 between two successive stands, without modifying the ratio between the driving speeds of the respective rolls.
- the tensimeter 15 installed at the outlet of the stand 1 acts on the hydraulic clamp 21 of the stand 2
- the tensimeter 25 installed at the outlet of the stand 2 acts on the hydraulic clamp 31 of the stand 3 and so on. It is then therefore guaranteed that permanently the speed of the band at the inlet of a stand is equal to the speed of the band at the outlet of the previous stand.
- the pre-adjustment system determines, according to the rolling pattern, the reduction in thickness to be performed in each stand and the speed of the corresponding motor, enabling to satisfy the equation (1).
- the tensimeter 15 installed in the inter-stand space 10 at the outlet of the stand 1 acts on the hydraulic clamp 21 of the stand 2
- the tensimeter 25 installed in the space 20 at the outlet of the stand 2 acts on the hydraulic clamp 31 of the stand 3 and so on. Thanks to this traction control, permanently the speed of the band at the inlet of a stand is kept equal to the speed of the band at the outlet of the previous stand.
- the thickness may be controlled, conventionally, by means of a feeler gauge 53 placed at the outlet 50 of the last stand 5 and acting on the speed V 5 of the motor 52 or, sometimes, of the motor 42 of the stand 4 .
- all the intermediate reductions are fixed using a pre-adjustment system which determines the intermediate thickness setpoints hi* of each stand whereon depends the rotational torque to be applied by each motorised means 12 , 22 , 32 , 42 , 52 .
- Such a pre-adjustment system may be formed simply of pre-adjustment tables specifying the intermediate thicknesses for each stand, but may also use a mathematic model capable of calculating the intermediate thicknesses h i * relative to the characteristics of the product to be rolled, on the basis of databases updated periodically by measurements on the rolling mill.
- the equation (2) enables to adjust the speeds as relative values with respect to one another.
- the pre-adjustment system determines all the thickness setpoints h i * relative to the characteristics of the product to be rolled and to the power available on the roll stands, with a certain degree of optimisation which depends on the performances of the mathematic model used.
- the portion of the system controlling a tandem rolling mill which manages all the speeds around that of a stand taken as a pivot and enables to control the acceleration and slowing down ramps is called commonly the ⁇ master speed>>.
- V 4 * h 3 */h 4 *V 3 *;
- V 2 * h 3 */h 2 * ⁇ V 3 *et
- the final control of the thickness is carried out by the gauge 53 installed at the outlet of the stand 5 , in order to correct the residual errors, by modifying the speed of the last stand of the rolling plant, or those of the last two stands.
- the invention enables to solve this problem by conducting, permanently, dynamic balance, between all the stands, of the torques to be applied by the motors.
- h i * shall designate the thickness of the band at the outlet of the stand i corresponding to the setpoint value of the reduction rate allocated to the stand i by the pre-adjustment system, and h i the value of the actual thickness at the outlet of the stand i.
- the idea of the invention is to decrease in real time the reduction rate of the stand when loaded too much, by modifying the speeds of the stands in order to change, by a device acting as a closed-loop, all the values h i * without disturbing the thickness of outlet h 5 which is held at constant value.
- a device acting as a closed-loop it is possible to diminish the reduction of the stand 3 , while increasing the thickness of outlet h 3 *. Consequently, to maintain constant the final thickness h 5 at the outlet 50 of the plant, it is necessary to require higher reduction at the stand 4 but, precisely, a power is available on the latter. There results an equilibrium of the currents by a transfer of power to the stands situated downstream of the stand loaded excessively.
- h 2 is also a constant thickness.
- a diminution of the speed setpoint of the stand 3 therefore causes an increase in the thickness of outlet h 3 and, consequently, a diminution of the torque to be applied by the motor 13 , which enables to produce the effect desired.
- the system for balancing the currents generates lengths outside the thickness tolerances corresponding to the distances between stands, each time it is necessary to change the speeds of the stands for balancing the currents, i.e. permanently since it is a real-time control system acting as a closed-loop.
- this potential thickness defect may be compensated for by anticipation by creating it beforehand, by changing simultaneously the speed of the stands 1 and 2 , in the example chosen.
- h 1 being held constant by the regulation of the stand 1
- h 2 will also be constant.
- the thickness of outlet h 3 will increase, which is the purpose.
- a real-time tracking device monitoring the infeed of the product in the plant is used for decreasing the speed of the stand 3 only when the excessive thickness h 3 reaches the stand 4 , the stands 1 and 2 being simultaneously reverted to their initial speeds, using devices acting as a closed-loop.
- the thickness h 3 has increased and, when the speed of the stand 3 is simultaneously decreased by resetting the speeds of the stands 1 and 2 to their initial values, the increased value of h 3 is kept, the flow rate h 3 V 3 being constant at the inlet of the stand 4 .
- the thickness h 4 is hence held constant as well as the thickness of outlet h 5 .
- the stand 3 It is thus possible to prevent any overloading of the stand 3 by modifying its reduction rate by a diminution of its speed and by transferring the power on the stands situated downstream.
- the potential thickness defect resulting from this instantaneous variation in speed may be compensated for by anticipation in order to hold constant the thickness of outlet h 5 , thanks to the method of the invention which enables to control in real time and during the transient interval, the instantaneous variations of the thickness, by means of a reverse temporary modification of the speeds of the stands situated upstream of the stand loaded excessively.
- a diminution in the speed setpoint V 1 * will therefore induce a diminution in the thickness h 2 which is the purpose.
- the thickness-tracking device working in real time and as a closed-loop enables to increase at the same time the speeds of the stands 1 and 2 to obtain the result desired without any variations in the thickness h 5 at the outlet of the rolling plant.
- any overloading in a stand is avoided while increasing the speed of the previous stand and, in order to compensate for the potential thickness defect thus generated, an increase in speed of the other stand(s) situated upstream is controlled.
- the invention thus enables to conduct a transfer of power from the overloaded stand to all the stands situated upstream, while holding constant the thickness of outlet.
- the method of the invention which operates in real time and is applied to a plant designed as a closed-loop, enables to re-balance permanently the currents of the driving motors of the stands by combining the effects of a balance on the upstream stands with those of a balance on the stands downstream, and this for all the stands simultaneously.
- the invention also covers a device for implementing the method represented for exemplification purposes on FIG. 2 .
- This representation is purely schematic since such a plant may make use, not only of the conventional technologies of electronic circuits with elementary circuitry of comparators, amplifiers, controllers, including themselves gain adjustments with proportional, integral and differential action, but also of more recent technologies of digital controls based upon calculators and microprocessors, providing they enable to act as a closed-loop, with response times sufficiently short to run an action in real time, with respect to the other response times of the other portions of the rolling plant.
- a level 6 for dynamic balancing of the currents as a closed-loop and a level 7 for controlling the transients which may be called the ⁇ thickness stage>>.
- the level 6 for dynamic balancing includes measuring the currents spent by the motors of the stands using current transformers 16 , 26 , 36 46 , 56 .
- the system for dynamic balancing 6 also contains comparison circuits capable of selecting permanently the most loaded stand, as well as the function of transfer and the gains necessary to the conversion of the load differences into a variation in the thickness setpoints, which will be the new thickness references h 1 * of the stands leading, in permanent duty cycle, to the equilibrium of the currents.
- the circuit 6 will generate the variations necessary for controlling the inter-stand thicknesses, using proportional, integral and differential gain adjustment controllers, in order to diminish the reduction rate of the most loaded stands as described in the method of the invention.
- the thickness stage 7 includes the circuits necessary to the transformation of the variations in the inter-stand thicknesses into speed setpoints of the driving motors, as well as those for managing the transients and, notably, the system for tracking the infeed the band B in the rolling plant.
- the controls of the transients 7 will work out the transient and anticipative variations in speed of the stands which will enable to balance the currents, without causing any variation, even transitory, in the thickness of outlet. All these circuits act in real time, in regulation and as a closed-loop between the measurement of the differences of the currents of the motors, taken to some extent as error signals at the inlet of the loop, and the variations in the speed setpoints of the driving motors, which constitute the outlet signals thereof.
- Such a device, according to the invention, for balancing the currents of the driving motors operating in real time and as a closed-loop, may be adapted to any device for controlling the thickness of outlet and is part integrally thereof.
- the invention is not limited to cold rolling and may also be applied to a tandem hot rolling mill as for instance the finishing train of a hot band train.
- control system AGC which has been described succinctly may be of any type enabling to control the final thickness of the rolled product. Indeed, since the invention is based on the respect of the ⁇ mass flow>> law, it would be possible to imagine variations in the operation of the thickness regulation.
- the implementation may be made in different ways without departing from the field of the invention, in particular according to rather recent digital and vector processing mode, usually denominated ⁇ multivariable regulation>>.
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Abstract
Description
h1V1=h2V2; h2V2=h3V3; h3V3=h4V4; h5V5 (1)
wherein h1 is the thickness and V1 the speed of the product at the outlet of the stand 1, and so on up to the
h1 *V 1 *=h 2 *V 2 *; h 2 *V 2 *=h 3 *V 3 *; h 3 *V 3 *=h 4 *V 4 ; h 4 *V 4 *=h 5 *V 5* (2)
h 5 *=h 4 *V 4 */V 5 *=h 3 *V 4 */V 5 *·V 3 */V 4* etc . . . =h 1 *V 1 *N 5*, i.e.: h 5 *=h 1 *V 1 */V 5* (3)
V 4 *=h 3 */h 4 *V 3 *; V 5 *=h 4 */h 5 *·V 4 *=h 4 */h 5 *·h 3 */h 4 *·V 3 *=h 3 */h 5 *·V 3* (4)
And similarly:
V 2 *=h 3 */h 2 *·V 3 *et V 1 *=h 2 */h 1 *·V 2 *=h 3 */h 2 *h 2 2 */h 1 *·V 3* i.e.: V 2 *=h 3 */h 2 *·V 3 *et V 1 *=h 3 */h 1 *·V 3* (5)
h 1 * V 1 *=h 2 * V 2*,
Claims (21)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0304583A FR2853570B1 (en) | 2003-04-11 | 2003-04-11 | METHOD AND DEVICE FOR REGULATING THE THICKNESS OF A ROLLED PRODUCT |
FR0304583 | 2003-04-11 |
Publications (2)
Publication Number | Publication Date |
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US20040221633A1 US20040221633A1 (en) | 2004-11-11 |
US7086260B2 true US7086260B2 (en) | 2006-08-08 |
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ID=32865426
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US10/811,499 Expired - Fee Related US7086260B2 (en) | 2003-04-11 | 2004-03-29 | Method and device for controlling the thickness of a rolled product |
Country Status (6)
Country | Link |
---|---|
US (1) | US7086260B2 (en) |
EP (1) | EP1466675B1 (en) |
JP (1) | JP2005095975A (en) |
DE (1) | DE602004003734T2 (en) |
ES (1) | ES2278288T3 (en) |
FR (1) | FR2853570B1 (en) |
Cited By (8)
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US20090113973A1 (en) * | 2007-11-07 | 2009-05-07 | Cox Iii Clarence B | Methods and Apparatus to Drive Material Conditioning Machines |
US20100193623A1 (en) * | 2007-07-05 | 2010-08-05 | Berthold Botta | Rolling of a strip in a rolling train using the last stand of the rolling train as a tension reducer |
US20100211209A1 (en) * | 2007-10-24 | 2010-08-19 | Reinhard Meissen | Adaptation of a controller in a rolling mill based on the variation of an actual value of a rolling product |
US20110041580A1 (en) * | 2007-11-02 | 2011-02-24 | Shigeru Ogawa | Rolling mill for a plate or a sheet and its control technique |
US20120047977A1 (en) * | 2010-10-06 | 2012-03-01 | Smith Gregory S | Apparatus and methods to increase the efficiency of roll-forming and leveling systems |
US20130160509A1 (en) * | 2010-06-09 | 2013-06-27 | Danieli Automation Spa | Method and device to control the section sizes of a rolled product |
US20130253692A1 (en) * | 2010-12-01 | 2013-09-26 | Hans-Joachim Felkl | Method For Actuating A Tandem Roll Train, Control And/Or Regulating Device For A Tandem Roll Train, Machine-Readable Program Code, Storage Medium And Tandem Roll Train |
US9138789B2 (en) | 2008-10-30 | 2015-09-22 | Siemens Aktiengesellschaft | Method for adjusting a drive load for a plurality of drives of a mill train for rolling rolling stock, control and/or regulation device, storage medium, program code and rolling mill |
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FR2887480B1 (en) * | 2005-06-23 | 2007-09-21 | Vai Clecim Soc Par Actions Sim | METHOD AND DEVICE FOR REGULATING THE THICKNESS OF A LAMINATED PRODUCT OUTSIDE A TANDEM ROLLING PLANT |
DE102008007057A1 (en) * | 2008-01-31 | 2009-08-13 | Siemens Aktiengesellschaft | Control method for a cold rolling mill with full mass flow control |
JP6045420B2 (en) * | 2013-03-27 | 2016-12-14 | 株式会社日立製作所 | Hot tandem rolling mill control apparatus and hot tandem rolling mill control method |
US10363590B2 (en) | 2015-03-19 | 2019-07-30 | Machine Concepts, Inc. | Shape correction leveler drive systems |
US20200338608A1 (en) * | 2018-01-10 | 2020-10-29 | Nippon Steel Corporation | Rolling method of shaped steel, production line of shaped steel, and production method of shaped steel |
US11318474B2 (en) * | 2018-05-14 | 2022-05-03 | Pearson Incorporated | Milling system and method |
WO2020104078A1 (en) | 2018-11-23 | 2020-05-28 | Cockerill Maintenance & Ingenierie S.A. | Flexible cold rolling mill and method for converting the same |
IT202000000316A1 (en) * | 2020-01-10 | 2021-07-10 | Danieli Off Mecc | METHOD AND APPARATUS FOR THE PRODUCTION OF FLAT METALLIC PRODUCTS |
CN111545575B (en) * | 2020-04-30 | 2021-11-05 | 中冶南方工程技术有限公司 | Thickness control method for five-stand cold continuous rolling mill in dynamic specification changing stage |
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2003
- 2003-04-11 FR FR0304583A patent/FR2853570B1/en not_active Expired - Fee Related
-
2004
- 2004-03-29 US US10/811,499 patent/US7086260B2/en not_active Expired - Fee Related
- 2004-04-08 ES ES04300199T patent/ES2278288T3/en not_active Expired - Lifetime
- 2004-04-08 EP EP04300199A patent/EP1466675B1/en not_active Expired - Lifetime
- 2004-04-08 DE DE602004003734T patent/DE602004003734T2/en not_active Expired - Lifetime
- 2004-04-12 JP JP2004116875A patent/JP2005095975A/en active Pending
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Also Published As
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US20040221633A1 (en) | 2004-11-11 |
DE602004003734D1 (en) | 2007-02-01 |
EP1466675B1 (en) | 2006-12-20 |
EP1466675A1 (en) | 2004-10-13 |
FR2853570A1 (en) | 2004-10-15 |
DE602004003734T2 (en) | 2007-10-04 |
JP2005095975A (en) | 2005-04-14 |
FR2853570B1 (en) | 2005-07-01 |
ES2278288T3 (en) | 2007-08-01 |
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